tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
3 * Copyright (C) 2012 Regents of the University of California
4 * Copyright (C) 2017 SiFive
5 * Copyright (C) 2017 XiaojingZhu <zhuxiaoj@ict.ac.cn>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation, version 2.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17#ifndef _ASM_RISCV_PAGE_H
18#define _ASM_RISCV_PAGE_H
19
20#include <linux/pfn.h>
21#include <linux/const.h>
22
23#define PAGE_SHIFT (12)
24#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
25#define PAGE_MASK (~(PAGE_SIZE - 1))
26
27/*
28 * PAGE_OFFSET -- the first address of the first page of memory.
29 * When not using MMU this corresponds to the first free page in
30 * physical memory (aligned on a page boundary).
31 */
32#define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
33
34#define KERN_VIRT_SIZE (-PAGE_OFFSET)
35
36#ifndef __ASSEMBLY__
37
38#define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
39#define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
40
41/* align addr on a size boundary - adjust address up/down if needed */
42#define _ALIGN_UP(addr, size) (((addr)+((size)-1))&(~((size)-1)))
43#define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
44
45/* align addr on a size boundary - adjust address up if needed */
46#define _ALIGN(addr, size) _ALIGN_UP(addr, size)
47
48#define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
49#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
50
51#define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
52#define copy_user_page(vto, vfrom, vaddr, topg) \
53 memcpy((vto), (vfrom), PAGE_SIZE)
54
55/*
56 * Use struct definitions to apply C type checking
57 */
58
59/* Page Global Directory entry */
60typedef struct {
61 unsigned long pgd;
62} pgd_t;
63
64/* Page Table entry */
65typedef struct {
66 unsigned long pte;
67} pte_t;
68
69typedef struct {
70 unsigned long pgprot;
71} pgprot_t;
72
73typedef struct page *pgtable_t;
74
75#define pte_val(x) ((x).pte)
76#define pgd_val(x) ((x).pgd)
77#define pgprot_val(x) ((x).pgprot)
78
79#define __pte(x) ((pte_t) { (x) })
80#define __pgd(x) ((pgd_t) { (x) })
81#define __pgprot(x) ((pgprot_t) { (x) })
82
83#ifdef CONFIG_64BITS
84#define PTE_FMT "%016lx"
85#else
86#define PTE_FMT "%08lx"
87#endif
88
89extern unsigned long va_pa_offset;
90extern unsigned long pfn_base;
91
92extern unsigned long max_low_pfn;
93extern unsigned long min_low_pfn;
94
95#define __pa(x) ((unsigned long)(x) - va_pa_offset)
96#define __va(x) ((void *)((unsigned long) (x) + va_pa_offset))
97
98#define phys_to_pfn(phys) (PFN_DOWN(phys))
99#define pfn_to_phys(pfn) (PFN_PHYS(pfn))
100
101#define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr)))
102#define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn)))
103
104#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
105#define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
106
107#define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
108#define page_to_bus(page) (page_to_phys(page))
109#define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
110
111#define pfn_valid(pfn) \
112 (((pfn) >= pfn_base) && (((pfn)-pfn_base) < max_mapnr))
113
114#define ARCH_PFN_OFFSET (pfn_base)
115
116#endif /* __ASSEMBLY__ */
117
118#define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
119
120#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
121 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
122
123#include <asm-generic/memory_model.h>
124#include <asm-generic/getorder.h>
125
126/* vDSO support */
127/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
128#define __HAVE_ARCH_GATE_AREA
129
130#endif /* _ASM_RISCV_PAGE_H */